// running.c -- A useful program for runners
#include <stdio.h>
const int S_PER_M = 60;			// seconds in a minute
const int S_PER_H = 3600;		// seconds in an hour
const double M_PER_K = 0.62137;	// miles in a kilometer
int main(void)
{
	double distk, distm;	// distance run in km and in miles
	double rate;			// average speed in mph
	int min, sec;			// minutes and seconds of running time
	int time;				// running time in seconds only
	double mtime;			// time in seconds for one mile
	int mmin, msec;			// minutes and seconds for one mile

	printf("This program converts your time for a metric race\n");
	printf("to a time for running a mile and to your average\n");
	printf("speed in mile per hour.\n");
	printf("Please enter, in kilometers, the distance run.\n");
	scanf("%lf", &distk);	// %lf for type double
	printf("Next enter the time in minutes and seconds.\n");
	printf("Begin by enter the minutes.\n");
	scanf("%d", &min);
	printf("Now enter the seconds.\n");
	scanf("%d", &sec);
	// converts time to pure seconds
	time = S_PER_M * min + sec;
	// converts kilometers to miles
	distm = M_PER_K * distk;
	// miles per sec x sec per hour = mph
	rate = distm / time * S_PER_H;
	// time/distance = time per mile
	mtime = (double)time / distm;	
	mmin = (int)mtime / S_PER_M;	// find whole minutes
	msec = (int)mtime % S_PER_M;	// find remaining seconds
	printf("You ran %1.2f km (%1.2f miles) in %d min, %d sec.\n",
		distk, distm, min, sec);
	printf("That pace corresponds to running a mile in %d min, ",
		mmin);
	printf("%d sec.\nYour average speed was %1.2f mph.\n", msec,
		rate);

	return 0;
}